Final answer:
In the peripheral nervous system, clusters of nerve cell bodies are called 'ganglia'. The term 'nucleus' is used in the central nervous system to describe similar structures. A dorsal (posterior) root ganglion is a common type of sensory ganglion in the PNS.
Step-by-step explanation:
Clusters of nerve cell bodies in the peripheral nervous system are called ganglia. This term is specific to structures in the peripheral nervous system (PNS), whereas the term nucleus is used to describe similar structures in the central nervous system (CNS). A ganglion consists of neuron cell bodies, and one common type of sensory ganglion is a dorsal (posterior) root ganglion. These contain the cell bodies of sensory neurons that extend into the CNS through dorsal nerve roots.